iOS: Add support for rendering native CVPixelBuffers directly

webrtc/sdk/objc/Framework/Classes/RTCEAGLVideoView.m

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 192 matching lines @@
 // These methods may be called on non-main thread.
 - (void)setSize:(CGSize)size {
   __weak RTCEAGLVideoView *weakSelf = self;
   dispatch_async(dispatch_get_main_queue(), ^{
     RTCEAGLVideoView *strongSelf = weakSelf;
     [strongSelf.delegate videoView:strongSelf didChangeVideoSize:size];
   });
 }
 
 - (void)renderFrame:(RTCVideoFrame *)frame {
+#if !TARGET_OS_IPHONE
   // Generate the i420 frame on video send thread instead of main thread.
   // TODO(tkchin): Remove this once RTCEAGLVideoView supports uploading
-  // CVPixelBuffer textures.
+  // CVPixelBuffer textures on OSX.
   [frame convertBufferIfNeeded];
+#endif
   self.videoFrame = frame;
 }
 
 #pragma mark - Private
 
 - (void)displayLinkTimerDidFire {
   // Don't render unless video frame have changed or the view content
   // has explicitly been marked dirty.
   if (!_isDirty && _glRenderer.lastDrawnFrame == self.videoFrame) {
     return;
@@ skipping 27 matching lines @@
 
 - (void)didBecomeActive {
   [self setupGL];
 }
 
 - (void)willResignActive {
   [self teardownGL];
 }
 
 @end